diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
new file mode 100644
index 0000000..dbc55cc
--- /dev/null
+++ b/.gitea/workflows/ci.yaml
@@ -0,0 +1,214 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+  workflow_dispatch:
+
+env:
+  REGISTRY: gcr.forust.xyz
+
+jobs:
+  lint:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Check formatting with Prettier
+        shell: bash
+        run: |
+          mapfile -t prettier_files < <(
+            git ls-files \
+              | grep -E '\.(md|json|ya?ml|html|css)$' \
+              | grep -Ev '^(\.docs/|\.zed/|errorpages/html/|homepages/(forust_files|xdfnx_files)/)'
+          )
+
+          if [ "${#prettier_files[@]}" -eq 0 ]; then
+            echo "No Prettier-managed files found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            node:22-alpine \
+            sh -lc 'npx --yes prettier@3 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
+
+      - name: Lint Python with Ruff
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            ghcr.io/astral-sh/ruff:latest \
+            check .
+
+      - name: Lint YAML syntax
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            cytopia/yamllint:latest \
+            -c .yamllint .
+
+      - name: Lint Dockerfiles
+        shell: bash
+        run: |
+          mapfile -t dockerfiles < <(
+            git ls-files ':(glob)**/Dockerfile' ':(glob)**/Dockerfile.*'
+          )
+
+          if [ "${#dockerfiles[@]}" -eq 0 ]; then
+            echo "No Dockerfiles found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            --entrypoint hadolint \
+            hadolint/hadolint:latest-debian \
+            -c .hadolint.yaml "${dockerfiles[@]}"
+
+  validate:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Validate YAML syntax
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            cytopia/yamllint:latest \
+            -c .yamllint .
+
+      - name: Validate Kubernetes manifests
+        shell: bash
+        run: |
+          mapfile -t manifests < <(
+            git ls-files ':(glob)**/k8s/**/*.yaml' ':(glob)**/k8s/**/*.yml' \
+              | grep -Ev '(^|/)(kustomization\.ya?ml|.*\.example\.ya?ml|.*values\.ya?ml|patch-.*\.ya?ml)$'
+          )
+
+          if [ "${#manifests[@]}" -eq 0 ]; then
+            echo "No Kubernetes manifests found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            ghcr.io/yannh/kubeconform:latest \
+            -strict \
+            -ignore-missing-schemas \
+            -summary \
+            "${manifests[@]}"
+
+  build:
+    if: github.event_name != 'pull_request' && github.ref_name == 'main'
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Detect changed docker-built services
+        id: services
+        shell: bash
+        run: |
+          base="${{ github.event.before }}"
+          if [ -z "$base" ] || [ "$base" = "0000000000000000000000000000000000000000" ]; then
+            base="$(git rev-list --max-parents=0 HEAD)"
+          fi
+
+          mapfile -t changed_files < <(git diff --name-only "$base" "${GITHUB_SHA}")
+
+          services=()
+
+          add_service() {
+            local name="$1"
+            local seen=0
+            for existing in "${services[@]}"; do
+              if [ "$existing" = "$name" ]; then
+                seen=1
+                break
+              fi
+            done
+            if [ "$seen" -eq 0 ]; then
+              services+=("$name")
+            fi
+          }
+
+          for file in "${changed_files[@]}"; do
+            case "$file" in
+              dtek_notif/*)
+                add_service dtek_notif
+                ;;
+              errorpages/*)
+                add_service errorpages
+                ;;
+              userbot/*)
+                add_service userbot
+                ;;
+              homepages/*)
+                add_service homepages
+                ;;
+              edu_master/phpsessid-bot/*|edu_master/webinar-checker/*|edu_master/compose.yaml)
+                add_service edu_master
+                ;;
+            esac
+          done
+
+          if [ "${#services[@]}" -eq 0 ]; then
+            echo "No docker-built services changed."
+            echo "services=" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          printf '%s\n' "${services[@]}" | tee /tmp/services.txt
+          echo "services=$(paste -sd, /tmp/services.txt)" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to registry
+        if: steps.services.outputs.services != ''
+        shell: bash
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "${REGISTRY}" \
+            -u "${{ secrets.REGISTRY_USERNAME }}" \
+            --password-stdin
+
+      - name: Build and push changed images
+        if: steps.services.outputs.services != ''
+        shell: bash
+        run: |
+          IFS=, read -r -a services <<< "${{ steps.services.outputs.services }}"
+
+          for service in "${services[@]}"; do
+            case "$service" in
+              dtek_notif)
+                docker build -t "${REGISTRY}/forust/dtek-notif:latest" dtek_notif
+                docker push "${REGISTRY}/forust/dtek-notif:latest"
+                ;;
+              errorpages)
+                docker compose -f errorpages/compose.yaml build errorpage
+                docker compose -f errorpages/compose.yaml push errorpage
+                ;;
+              userbot)
+                docker compose -f userbot/compose.yaml build forust
+                docker compose -f userbot/compose.yaml push forust
+                ;;
+              homepages)
+                docker compose -f homepages/compose.yaml build forust xdfnx
+                docker compose -f homepages/compose.yaml push forust xdfnx
+                ;;
+              edu_master)
+                docker compose -f edu_master/compose.yaml build session-keeper webinar-checker
+                docker compose -f edu_master/compose.yaml push session-keeper webinar-checker
+                ;;
+            esac
+          done
diff --git a/.gitea/workflows/lint.yaml b/.gitea/workflows/lint.yaml
deleted file mode 100644
index 3b8e336..0000000
--- a/.gitea/workflows/lint.yaml
+++ /dev/null
@@ -1,90 +0,0 @@
-name: lint
-
-on:
-  push:
-    branches:
-      - "**"
-  pull_request:
-  workflow_dispatch:
-
-jobs:
-  prettier:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Check formatting with Prettier
-        shell: bash
-        run: |
-          mapfile -t prettier_files < <(
-            git ls-files \
-              | grep -E '\.(md|json|ya?ml|html|css)$' \
-              | grep -Ev '^(\.docs/|\.zed/|errorpages/html/|homepages/(forust_files|xdfnx_files)/)'
-          )
-
-          if [ "${#prettier_files[@]}" -eq 0 ]; then
-            echo "No Prettier-managed files found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            node:22-alpine \
-            sh -lc 'npx --yes prettier@3 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
-
-  ruff:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint Python with Ruff
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            ghcr.io/astral-sh/ruff:latest \
-            check .
-
-  yamllint:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint YAML syntax
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            cytopia/yamllint:latest \
-            -c .yamllint .
-
-  hadolint:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint Dockerfiles
-        shell: bash
-        run: |
-          mapfile -t dockerfiles < <(
-            git ls-files ':(glob)**/Dockerfile' ':(glob)**/Dockerfile.*'
-          )
-
-          if [ "${#dockerfiles[@]}" -eq 0 ]; then
-            echo "No Dockerfiles found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            --entrypoint hadolint \
-            hadolint/hadolint:latest-debian \
-            -c .hadolint.yaml "${dockerfiles[@]}"
diff --git a/.gitea/workflows/validate.yaml b/.gitea/workflows/validate.yaml
deleted file mode 100644
index f29dddd..0000000
--- a/.gitea/workflows/validate.yaml
+++ /dev/null
@@ -1,52 +0,0 @@
-name: validate
-
-on:
-  push:
-    branches:
-      - "**"
-  pull_request:
-  workflow_dispatch:
-
-jobs:
-  yaml:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint YAML syntax
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            cytopia/yamllint:latest \
-            -c .yamllint .
-
-  k8s:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Validate Kubernetes manifests
-        shell: bash
-        run: |
-          mapfile -t manifests < <(
-            git ls-files ':(glob)**/k8s/**/*.yaml' ':(glob)**/k8s/**/*.yml' \
-              | grep -Ev '(^|/)(kustomization\.ya?ml|.*\.example\.ya?ml|.*values\.ya?ml|patch-.*\.ya?ml)$'
-          )
-
-          if [ "${#manifests[@]}" -eq 0 ]; then
-            echo "No Kubernetes manifests found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            ghcr.io/yannh/kubeconform:latest \
-            -strict \
-            -ignore-missing-schemas \
-            -summary \
-            "${manifests[@]}"
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..dbc55cc
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,214 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+  workflow_dispatch:
+
+env:
+  REGISTRY: gcr.forust.xyz
+
+jobs:
+  lint:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Check formatting with Prettier
+        shell: bash
+        run: |
+          mapfile -t prettier_files < <(
+            git ls-files \
+              | grep -E '\.(md|json|ya?ml|html|css)$' \
+              | grep -Ev '^(\.docs/|\.zed/|errorpages/html/|homepages/(forust_files|xdfnx_files)/)'
+          )
+
+          if [ "${#prettier_files[@]}" -eq 0 ]; then
+            echo "No Prettier-managed files found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            node:22-alpine \
+            sh -lc 'npx --yes prettier@3 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
+
+      - name: Lint Python with Ruff
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            ghcr.io/astral-sh/ruff:latest \
+            check .
+
+      - name: Lint YAML syntax
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            cytopia/yamllint:latest \
+            -c .yamllint .
+
+      - name: Lint Dockerfiles
+        shell: bash
+        run: |
+          mapfile -t dockerfiles < <(
+            git ls-files ':(glob)**/Dockerfile' ':(glob)**/Dockerfile.*'
+          )
+
+          if [ "${#dockerfiles[@]}" -eq 0 ]; then
+            echo "No Dockerfiles found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            --entrypoint hadolint \
+            hadolint/hadolint:latest-debian \
+            -c .hadolint.yaml "${dockerfiles[@]}"
+
+  validate:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Validate YAML syntax
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            cytopia/yamllint:latest \
+            -c .yamllint .
+
+      - name: Validate Kubernetes manifests
+        shell: bash
+        run: |
+          mapfile -t manifests < <(
+            git ls-files ':(glob)**/k8s/**/*.yaml' ':(glob)**/k8s/**/*.yml' \
+              | grep -Ev '(^|/)(kustomization\.ya?ml|.*\.example\.ya?ml|.*values\.ya?ml|patch-.*\.ya?ml)$'
+          )
+
+          if [ "${#manifests[@]}" -eq 0 ]; then
+            echo "No Kubernetes manifests found."
+            exit 0
+          fi
+
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            ghcr.io/yannh/kubeconform:latest \
+            -strict \
+            -ignore-missing-schemas \
+            -summary \
+            "${manifests[@]}"
+
+  build:
+    if: github.event_name != 'pull_request' && github.ref_name == 'main'
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Detect changed docker-built services
+        id: services
+        shell: bash
+        run: |
+          base="${{ github.event.before }}"
+          if [ -z "$base" ] || [ "$base" = "0000000000000000000000000000000000000000" ]; then
+            base="$(git rev-list --max-parents=0 HEAD)"
+          fi
+
+          mapfile -t changed_files < <(git diff --name-only "$base" "${GITHUB_SHA}")
+
+          services=()
+
+          add_service() {
+            local name="$1"
+            local seen=0
+            for existing in "${services[@]}"; do
+              if [ "$existing" = "$name" ]; then
+                seen=1
+                break
+              fi
+            done
+            if [ "$seen" -eq 0 ]; then
+              services+=("$name")
+            fi
+          }
+
+          for file in "${changed_files[@]}"; do
+            case "$file" in
+              dtek_notif/*)
+                add_service dtek_notif
+                ;;
+              errorpages/*)
+                add_service errorpages
+                ;;
+              userbot/*)
+                add_service userbot
+                ;;
+              homepages/*)
+                add_service homepages
+                ;;
+              edu_master/phpsessid-bot/*|edu_master/webinar-checker/*|edu_master/compose.yaml)
+                add_service edu_master
+                ;;
+            esac
+          done
+
+          if [ "${#services[@]}" -eq 0 ]; then
+            echo "No docker-built services changed."
+            echo "services=" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          printf '%s\n' "${services[@]}" | tee /tmp/services.txt
+          echo "services=$(paste -sd, /tmp/services.txt)" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to registry
+        if: steps.services.outputs.services != ''
+        shell: bash
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "${REGISTRY}" \
+            -u "${{ secrets.REGISTRY_USERNAME }}" \
+            --password-stdin
+
+      - name: Build and push changed images
+        if: steps.services.outputs.services != ''
+        shell: bash
+        run: |
+          IFS=, read -r -a services <<< "${{ steps.services.outputs.services }}"
+
+          for service in "${services[@]}"; do
+            case "$service" in
+              dtek_notif)
+                docker build -t "${REGISTRY}/forust/dtek-notif:latest" dtek_notif
+                docker push "${REGISTRY}/forust/dtek-notif:latest"
+                ;;
+              errorpages)
+                docker compose -f errorpages/compose.yaml build errorpage
+                docker compose -f errorpages/compose.yaml push errorpage
+                ;;
+              userbot)
+                docker compose -f userbot/compose.yaml build forust
+                docker compose -f userbot/compose.yaml push forust
+                ;;
+              homepages)
+                docker compose -f homepages/compose.yaml build forust xdfnx
+                docker compose -f homepages/compose.yaml push forust xdfnx
+                ;;
+              edu_master)
+                docker compose -f edu_master/compose.yaml build session-keeper webinar-checker
+                docker compose -f edu_master/compose.yaml push session-keeper webinar-checker
+                ;;
+            esac
+          done
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
deleted file mode 100644
index 3b8e336..0000000
--- a/.github/workflows/lint.yaml
+++ /dev/null
@@ -1,90 +0,0 @@
-name: lint
-
-on:
-  push:
-    branches:
-      - "**"
-  pull_request:
-  workflow_dispatch:
-
-jobs:
-  prettier:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Check formatting with Prettier
-        shell: bash
-        run: |
-          mapfile -t prettier_files < <(
-            git ls-files \
-              | grep -E '\.(md|json|ya?ml|html|css)$' \
-              | grep -Ev '^(\.docs/|\.zed/|errorpages/html/|homepages/(forust_files|xdfnx_files)/)'
-          )
-
-          if [ "${#prettier_files[@]}" -eq 0 ]; then
-            echo "No Prettier-managed files found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            node:22-alpine \
-            sh -lc 'npx --yes prettier@3 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
-
-  ruff:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint Python with Ruff
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            ghcr.io/astral-sh/ruff:latest \
-            check .
-
-  yamllint:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint YAML syntax
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            cytopia/yamllint:latest \
-            -c .yamllint .
-
-  hadolint:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint Dockerfiles
-        shell: bash
-        run: |
-          mapfile -t dockerfiles < <(
-            git ls-files ':(glob)**/Dockerfile' ':(glob)**/Dockerfile.*'
-          )
-
-          if [ "${#dockerfiles[@]}" -eq 0 ]; then
-            echo "No Dockerfiles found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            --entrypoint hadolint \
-            hadolint/hadolint:latest-debian \
-            -c .hadolint.yaml "${dockerfiles[@]}"
diff --git a/.github/workflows/validate.yaml b/.github/workflows/validate.yaml
deleted file mode 100644
index f29dddd..0000000
--- a/.github/workflows/validate.yaml
+++ /dev/null
@@ -1,52 +0,0 @@
-name: validate
-
-on:
-  push:
-    branches:
-      - "**"
-  pull_request:
-  workflow_dispatch:
-
-jobs:
-  yaml:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Lint YAML syntax
-        shell: bash
-        run: |
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            cytopia/yamllint:latest \
-            -c .yamllint .
-
-  k8s:
-    runs-on: [self-hosted, linux, arch, homelab]
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Validate Kubernetes manifests
-        shell: bash
-        run: |
-          mapfile -t manifests < <(
-            git ls-files ':(glob)**/k8s/**/*.yaml' ':(glob)**/k8s/**/*.yml' \
-              | grep -Ev '(^|/)(kustomization\.ya?ml|.*\.example\.ya?ml|.*values\.ya?ml|patch-.*\.ya?ml)$'
-          )
-
-          if [ "${#manifests[@]}" -eq 0 ]; then
-            echo "No Kubernetes manifests found."
-            exit 0
-          fi
-
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            ghcr.io/yannh/kubeconform:latest \
-            -strict \
-            -ignore-missing-schemas \
-            -summary \
-            "${manifests[@]}"